#include <iostream>
#include <string>

using namespace std;

void output(string str);
void output(int integ);
void output(double a);

void output(string a)
{
    cout<<"这是字符串:"<<a<<endl;
}

void output(int a)
{
    cout<<"这是整数:"<<a<<endl;
}

void output(double a)
{
    cout<<"这是浮点数:"<<a<<endl;
}

int main()
{
    string a="hello world";
    int b=100;
    double c=3.14159265;

    output(a);
    output(b);
    output(c);

    return 0;
}